Answer :

6r + 7 = 13 + 7r

subtract 6r from both sides...

7 = 13 + r

subtract 13 from both sides...

-6 = r

r = -6
luana
[tex]6r+7=13+7r\ \ \ \ | subtract\ 6r\\\\ 7=13+r\ \ \ \ | subtract\ 13\ \ \ \\\\ -6=r\\\\Solution\ is\ r=-6.[/tex]

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